Automatic telephone-selector or ringing device.



R1 Rf HOBBS.

AUTOMATIC TELEPHONE SELECTOR 0R RINGING DEVICE. APPLIUATION FILED AUG. 11, 1909.

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Patented Feb. 14, 1911.

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ROE R. HOBBS, OF LOUISVILLE, KENTUCKY.

AUTOMATIC TELEPHONE-SELECTOR OR RINGING DEVICE.

R 983,899. Speeicaton 0f Letters Patent. Patented Feb. itat, 193ML. Application filed August 11, 1909. Serial No. 512,466.

To all whom it may concern:

Be it known that I, Ron R. Hours, a citizen ofthe United States, residing at Louisville, in the county of Jefferson and State of l Kentucky, have invented new and useful improvements in automatic telephone-seleci tors or ringing' devices for use on telephone I partylines, railroad telephone despatchinglines, and for general use on other telephonelines with more than two stations for the purpose of ringing any particular bell desired without disturbing or ringing the other bells connected to the same circuit, of which the following is a specification.

My invention relates to improvements in an electric telephone selector, or ringing device, and consists of a polarized relay, wound to the proper resistance, operating on positive and negative electrical impulses, and a ratchet-wheel mounted on a. suitable frame above the said relay so arranged with arms, dog and pawl that the operation of one side of the said relay armature will cause the ratchet-wheel to move one tooth in a specified direction and automatically lock the same at the point where impulses cease on that side. lVhen the opposite side of the relay armature is worked through or by reason of electric impulse the ratchet-wheel is released automatically and a contact point is caused to touch a pin placed at the desired position on the face of the ratchet-wheel, thereby closing a local bell circuit. The ratchet-wheel is returned to normal position instantly by means of a spring, or weight, as desired, when all current ceases through both sides of the polarized relay.

This invention is designed to provide for a. system of telephone ringing or signaling apparatus whereby any particular telephone station may be called without causing all the other telephone stations on that particular line to be called, or signaled.

Furthermore, this invention provides means whereby the direct action of the polarized relay upon the ratchet-wheel will reduce and minimize the failure to operate the said ringing device successfully under all circumstances.

This invention further provides for a method of placing a ratchet-wheel above, and in proXimity with, the armature of an ordinary polarized relay so that the said ratchet-wheel will operate one notch at a time with each and every impulse passing through one of the coils of said polarized relay, thereby placing' the ratchet-wheel in any desired position at a distant telephone station, this position on said ratchet-wheel within reach of an arm controlled by the opposite coil of the polarized relay.

The invention will be best understood by consideration of the following detail description taken in connection with the accompanying drawing' forming part of this specibcation, in which drawings,

Figure l is a full size front view, showing all mechanism in normal position. Fig. 2 is a side view showing all parts in normal position also.

Referring to the drawings, and more especially to Fig. l, A1 and A2 polarized relay, wound to a required resistance, connected in series, and the outside wires from coils connected to binding-posts L1 and L2, which are in turn connected, or bridged, directly across the two sides of the telephone or other electrical circuits. The of a positive electrical impulse through the coils of the polarized magnet attracts armature C toward the core of coil A1 thereby raising arm D which, by means of a pawl on its upper end, engages ratchet wheel J and moves it one notch or tooth, this movement of armature C also depressing arm F which engages arm G by means of an elongated hole and a center pin which moves pawl Q into engagement with ratchet wheel J, the upper part of the elongated hole engaging the center pin on arm G moving it in a downward direction and moving pawl Q, by means of tight slipping joint H, into engagement with ratchet wheel J a positive movement of armature C toward coil A2 raises arm F and causes the lower edge of the elongated hole to engage pin on arm G, moving arm C in an upward direction and, by means of tight slipping ljoint H, withdrawing pawl Q, from engagement with ratchet wheel J. Joint H, on arm G, is a tight slipping joint which causes pawl Q to remain in any position in which it is left by arm G. The sending of a negative electrical impulse through the coils of the polarized magnet causes armature C to be attracted toward the core of coil A2, thereby raising arm F which, acting on arm Cr and through a coiled spring and adjusting nut on arm T, throws bell crank lever T bent horizontally at its upper end, into engagement with contact pin R on ratchet wheel J,

are the coils of abringing a contact point thereby closing an electrical circuit between a polarized magnet, a frame, a ratchet wheel arm I and binding post B2,- there being a vimounted thereon having holesbored oppobrating bell connected to binding posts B1 site and adjacent to each tooth thereof, a and B2 with battery in series. Springs N Contact pin adapted to be inserted in any one and N2 are for the purpose of equalizing the of said holes, a bell crank lever on said movement of armature C and causing it to frame bent horizontally at its upper end,

stand in a neutral position when not in use. said lever having a contact point at the endV In the negative movement of armature C, l of its horizontally bent portion to engage lever F being raised also acts on lever G, with said contact pin, a horizontally ar- 10 pulling catch Q, out of the ratchet-wheel and ranged holding pawl p ivoted to said frame allowing the ratchet-wheel to return to norand frictionally engaging its pivot, a link mal position as soon as current is discontinconnecting one end lof the armature of said ued in coil A2 which releases. lever I. Joint magnet to said holdingpawl through a pin H. on lever L. is a tight slipping ]oint allowand slot connection, and a link adjustably ing lever L. to stand in any position placed connecting said holding pawl with the lower by lever F. Joint S. is insulated from lever arm of said bell crank lever whereby the G. by fiber or other insulated bushing. polarized magnet is adapted to throw said Ratchet-wheel J. is bored with hole opposite contact point into engagement with said each tooth so that contact pin R. can be contact pin when desired.

20 placed in any desired position. In testimony of the fact that I claim the In Fig. 2, K. is a weight attached to the foregoing as my own, I have hereto affixed ratchet-wheel J. by spring or cord and the function of this weight K. is to cause nesses. the ratchet-wheel J. to return to normal po- VROE It. IIOBBS.

25 sition when released by lever D and catch Q. IVitnesses:

lVhat is claimed is P. C. MoIN'rosii, In a selective system, the combination of S. T. GADDiii.

my signature in the presence of two wit- 

